From: Pan Li <pan2...@intel.com>
In same cases, like gcc/testsuite/gcc.dg/pr78148.c in RISC-V, there will
be only 1 operand when SET_SRC in create_pre_exit. For example as below.
(insn 13 9 14 2 (clobber (reg/i:TI 10 a0))
"gcc/testsuite/gcc.dg/pr78148.c":24:1 -1
(expr_list:REG_UNUSED (reg/i:TI 10 a0)
(nil)))
Unfortunately, SET_SRC requires at least 2 operands and then Segment
Fault here. This patch would like to fix this ICE by ignoring the USE
and CLOBBER insn before SET_SRC.
Signed-off-by: Pan Li <pan2...@intel.com>
gcc/ChangeLog:
* mode-switching.cc (create_pre_exit): Add USE and CLOBBER check.
* rtl.h (CLOBBER_OR_USE_P): New macro.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/mode-switch-ice-1.c: New test.
---
gcc/mode-switching.cc | 1 +
gcc/rtl.h | 4 ++++
.../gcc.target/riscv/mode-switch-ice-1.c | 22 +++++++++++++++++++
3 files changed, 27 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/riscv/mode-switch-ice-1.c
diff --git a/gcc/mode-switching.cc b/gcc/mode-switching.cc
index 64ae2bc29c3..8bb016a811d 100644
--- a/gcc/mode-switching.cc
+++ b/gcc/mode-switching.cc
@@ -411,6 +411,7 @@ create_pre_exit (int n_entities, int *entity_map, const int
*num_modes)
conflict with address reloads. */
if (copy_start >= ret_start
&& copy_start + copy_num <= ret_end
+ && !CLOBBER_OR_USE_P (return_copy_pat)
&& OBJECT_P (SET_SRC (return_copy_pat)))
forced_late_switch = true;
break;
diff --git a/gcc/rtl.h b/gcc/rtl.h
index e1c51156f90..cdc2941c210 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -1768,6 +1768,10 @@ extern const char * const reg_note_name[];
#define VAR_LOC_UNKNOWN_P(X) \
(GET_CODE (X) == CLOBBER && XEXP ((X), 0) == const0_rtx)
+/* Determine whether RTX is USE or CLOBBER. */
+#define CLOBBER_OR_USE_P(RTX) \
+ (GET_CODE (RTX) == USE || GET_CODE (RTX) == CLOBBER)
+
/* 1 if RTX is emitted after a call, but it should take effect before
the call returns. */
#define NOTE_DURING_CALL_P(RTX) \
diff --git a/gcc/testsuite/gcc.target/riscv/mode-switch-ice-1.c
b/gcc/testsuite/gcc.target/riscv/mode-switch-ice-1.c
new file mode 100644
index 00000000000..1b34a471904
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/mode-switch-ice-1.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+struct A { char e, f; };
+
+struct B
+{
+ int g;
+ struct A h[4];
+};
+
+extern void bar (int, int);
+
+struct B foo (void)
+{
+ bar (2, 1);
+}
+
+void baz ()
+{
+ foo ();
+}
--
2.34.1
